A variation of Fort Payne Chert, Blue Gray Fort Payne Chert has primary outcroppings in Bear Creek drainage in the Tennessee River Valley in Northern Alabama. On the northern side of the Tennessee River near Wilson Dam, the upper Flint River Drainage, around Mussel Shoals and Colbert Shoals. Has been found in cobble form along Duck Creek and Riley Creek in Tennessee. May have same distribution as Fort Payne Chert.